Speedometer question

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Posted by Tim Holloway [162.158.63.79] on Saturday, September 15, 2018 at 19:52:42 :

OK, on my 57 W-100, my speedometer reads 20% slow, across the board, 20%. Doesn't matter if it says 20 mph, I am at about 25. 50 mph I am at 60. I figured the speedometer pinion in the transfer case must be incorrect. I had the truck up on the lift today for other work and decided to go ahead and pull the pinion and see what I had. The parts book calls for pinion #1268-649 (4:11 gears with 7:50-16" tires) Using a magnifying glass to read the tiny numbers stamped on the pinion, that is just what I have! So now I am stumped. Can the speedometer be that far out of calibration? Is there an adjustment that can be done in house or is it a send it out for the specialists to deal with?
Thanks,
Tim

Follow Ups:

Re: Speedometer question - Jerry Henry 15:28:22 09/17/2018

Re: Speedometer question - Tim Holloway 19:42:15 09/17/2018
- Re: Speedometer question - Clint Dixon 19:56:39 09/17/2018
  - Re: Speedometer question - Tim Holloway 21:27:46 09/17/2018
    - Re: Speedometer question - Tom Petroff (IL) 21:42:36 09/17/2018
      - Re: Speedometer question - Tim Holloway 22:23:50 09/17/2018
  - Re: Speedometer question - John B 20:19:47 09/17/2018
    - Re: Speedometer question - Paul in New Zealand 19:02:34 09/20/2018

ratio adapter - Bruce in seriously wet BC 19:42:03 09/16/2018

Re: Speedometer question - Tim Ellis 10:50:14 09/16/2018

Re: Speedometer question - Milo in Pa 12:21:17 09/16/2018
- Re: Speedometer question - Tim Ellis 07:32:11 09/17/2018

Re: Speedometer question - Jerry Henry 23:12:55 09/15/2018

Re: Speedometer question - Tim Holloway 08:10:11 09/16/2018
- Re: Speedometer question - Jerry Henry 10:03:40 09/16/2018

Re: Speedometer question, oil - The Dodge Boys 22:09:44 09/15/2018

Re: Speedometer question, oil - Tim Holloway 22:14:06 09/15/2018
- Re: Speedometer question, oil - The Dodge Boys 22:30:56 09/15/2018
  - Re: Speedometer question, oil - Tim Holloway 22:52:35 09/15/2018

Tim - Paul(in NY) 21:46:06 09/15/2018

Re: Tim - Keith in Washington 11:49:52 09/16/2018
Re: Tim - Tim Holloway 21:54:49 09/15/2018
- Smaller pinion by 20% ? - Chris Case 09:04:56 09/16/2018

Magnet might be weak - Eric B. 21:43:41 09/15/2018

Re: Magnet might be weak - Tim Holloway 21:56:18 09/15/2018

Re: Speedometer question - Todd Somers 21:18:58 09/15/2018

Re: Speedometer question - Tim Holloway 21:38:33 09/15/2018

Re: Speedometer question - Kevin Clause 21:12:02 09/15/2018

Re: Speedometer question - Tim Holloway 21:18:27 09/15/2018

Re: Speedometer question - Milo in Pa 20:51:10 09/15/2018

Re: Speedometer question - Johnd 08:14:39 09/16/2018
Re: Speedometer question - Tim Holloway 20:52:10 09/15/2018

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